How many letters does the top answer for “an altered form of a toxin, possessing little or no toxic power.” have?

The most common answer is toxoid (6 letters).

Crossword clue: an altered form of a toxin, possessing little or no toxic power.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

toxoid 6 letters web-def

a bacterial toxin that has been weakened until it is no longer toxic but is strong enough to induce the formation of ant